Slider pumps



April 2, 1963 G. WEISS SLIDER PUMPS Filed Sept. 17, 1959 5 w M M m NT ER VA m 2 l, 4 5 6 m H, F H 3 H 34 Y F H H Lm B F 0 7 2 f \E 1 AQ A 5 3 5 3 2, 0% .H v \I I I I z 4 J m fi u 5 G F 2 z 4 W- 5 65 F 8 l w JP A m 7 1 f r l 6 9 m 2 l Uite States Patent Ofifice 3,983,646 Patented Apr. 2, 1963 #933,646 Slit PUM?S Gerhart vveiss, Mineola, N.Y., assigns! to American Thermoeatalytic (Ierporation, Mineoia, NFL, a corporation of New Yerk Filed Sept, 1?, 1.959, Ser. No. 849,767 1 Claim. (61. 1t33-144) This invention relates to rotary pumps of the slider or vanes type, and more specifically to a pump where the vanes are arranged rotatable within a substantially cylindrical housing or casing, about an axis disposed eccentrically with respect to the axis of the housing.

The invention is a continuation in part of US. Serial Number 766,896, filed October 13, 1958.

One of the objects of the invention is to support the vanes on this axis fixedly or immovable at least in radial direction, so as to provide a predetermined gap extending at least along a peripheral distance or" the housing, corresponding to or slightly exceeding the distance between an adjacent pair of vanes; and to arrange such peripheral gap symmetrically with or in the center between inlet and outlet openings arranged at both sides of the gap, respectively.

Another object of the invention is to make these inlet and outlet openings gradually increasing in cross section at both sides of the peripheral gap so as to reduce discontinuity in flow to a minimum.

A more specific object of the invention is to gradually vary the cross section of these inlet and outlet openings in either axial or radial direction, or if necessary in both directions.

These and other objects of the invention will be more fully apparent from the drawings annexed herewith in which FIGS. 1 and 2, in front and side elevations, respectively (both in sectional views along lines 22 and 1-1 respectively), represents a rotatable pump embodying certain principles of the invention.

FIGS. 3 and 4 show corresponding views of a modified pump, also according to the invention.

In FIGS. 1 and 2 casing or housing 1 of the rotary pump is shown to contain a substantially cylindrical pump space 2 and arranged therein a shaft 3 supporting hub 4 to which there are attached or formed in, radial vanes or impeller blades 5. Hub 4 consists of rubber, plastic, or similar flexible material permitting peripheral relative movements of blades 5 while maintaining blade 5 in predeterminedly fixed position with respect to the wall of housing 1.

Hub 4 is either fixedly supported on the rotatable shaft 3, or rotatable supported on a rigid shaft 3. Impeller blades 5 are driven in otherwise well known manner by a rotor 6 which is rotated by a shaft 7 arranged eccentrically with respect to the cylindrical pump space 2, and its axis 3.

Rotor 6 has a number of peripheral slots 8 through which blades 5 extend radially into the annular pump space proper, formed between rotor 6 and housing 1.

symmetrically arranged between inlet and outlet open ings 9, 10 (on the assumption that rotation of rotor 6 and impeller blades 5 occurs clockwise in the direction of arrow 11), there is arranged the peripheral minimum space or work gap 12, between blades 5 and the inner wall of housing 1. Work gap 12 extends over a distance approximately equal and preferably slightly exceeding that of the peripheral distance between adjacent blades 5 in their top or working position.

symmetrically arranged with respect to working gap 12, there is also arranged another peripheral gap 13 of dimensions similar to those of peripheral gap 12, separating the other ends of inlet and outlet openings 9, 10 from each other.

In order to provide an optimum continuity in the movement of the gas or fluid to be pumped or exhausted by the device, in accordance with the invention, inlet and outlet openings 9, it), are shaped gradually varying, increasing in cross section from peripheral gap 12 toward peripheral gap 13 and the entry and exit bores proper, schematically indicated at 14, 15 respectively.

In the embodiment shown in FIGS. 1 and 2, such variation or increase in cross section of inlet and outlet openings 9, 10, is shown to occur principally in radial direction whereby the cylindrical wall of pump space 2 is shaped to extend into a straight line wall section indicated by lines 16 and 17, respectively, and terminated by perpendicular wall lines 18 19., respectively, which extend up to the opposite ends of the peripheral bottom gap 13.

In the modification of the invention shown in FIGS. 3 and 4, inlet and outlet openings are shown to gradually Vary in cross section in axial direction as indicated by wall lines 29 and 21, respectively.

In accordance with another feature of the invention (but not necessarily in combination with the axial extension represented by wall lines 20, 21) radial extensions of inlet and outlet openings are also provided in the form of wall lines 16, 17 and 18, 19, respectively, in a manner similar to that shown in FIGS. 1 and 2, all such wall extensions terminating at opposite ends of lower peripheral gap 13, also in a manner similar to that shown in FIGS. 1 and 2 or in any other appropriate manner.

While the invention has been described and illustrated by certain specific shapes and arrangements of blades, housings, inlet and outlet openings, it is not necessarily limited thereto, but may be applied in any other appropriate form or manner whatsoever without departing from the scope of this disclosure.

I claim:

A rotary slider pump comprising an outer casing having a longitudinal axis and having an inner space with transverse end walls with a peripheral wall, a shaft, means mounting said shaft rotatably in said casing with the axis of said shaft coinciding with the axis of said outer casing, a cylindrical rotor, means mounting said rotor in said casing so that its axis is offset with respect to and parallel to said longitudinal axis, said shaft extending through said rotor, said rotor having axial slots extending in the direction of length thereof and equally circumferentially spaced, a hub fixedly mounted on said shaft, rigid vanes resiliently fixed to said hub and extending radially therefrom and of length corresponding to the longitudinal dimension of said rotor slots, said vanes also extending longitudinally and being equally circumferentially spaced and respectively extending slidably through said rotor slots, the tips of said vanes being located in a cylinder of revolution whose axis is said longitudinal axis, said peripheral Wall having a first part-cylindrical portion which is symmetrically disposed with respect to the region of maximum extension of said blades beyond the periphery of said rotor and having a second part-cylindrical portion which is symmetrically disposed with respect to the region of minimum extension of said blades beyond the periphery of said rotor, said partcylindrical portions having as their aids said longitudinal axis and the diameter of their cylinder being such as to receive the tips of the rotating vanes in close proximity to said part-cylindrical portions, the circumferential distance of said first cylindrical wall portion corresponding approximately to not more than the circumferential distance between successive blade tips, said peripheral wall having a cutout on either side of said first part-cylindrical portion, said cutout starting with minimal lengm and gradually increasing in axial length in the circumferential direction away from said first part-cylindrical portion until the eral wall so as to provide pressure relief, said casing hawing a respective inlet andoutlet therein cemmuni'cating with the inner spacethereef respectively on either side of and substantially spaced circumferentially from sai'd'first part-cylindrical wall portion and at points of said inner space at which the tips of said vanes are substantially spaced radially from said peripheral wall;

References Cited in the file of this patent UNITED STATES PATENTS 123,575 Massey Feb. 13, 1872 467,612 Nichols Jan. 26, 1892' 1,262,437 Bergnian Apr. 9, 1918 Campbell Apr. 5, 1932 Haydock Feb. 16, 1937 Gerdau Apr. 6, 1937 Bateman Apr. 13, 1937 Tilton Oct. 25, 1938 Briggs Feb. 6, 1940 Napolitano Feb. 25, 1941 Rumsey Nov. 30, 1948 Hartzler July 26, 1949 Livermore Apr. 4, 1961 FOREIGN PATENTS V Germany Dec. 12, 1893 Germany Dec. 5, 1 908 Great Britain June 1, 1933 Italy Nov, 19, 1955 Great Britain Dec. 31, 1942' France Oct. 11, 1943 France Mar. 26, 1952 

